Rigetti Computing: what changed.
The recorded research and its supporting evidence.
This is a historical record. Read the current company research →Evidence or assessment clarified · axis ratings unchanged
Assessment reviewed 7 Sept 2026 · Research reviewed 7 Sept 2026What changed
- What the research demonstrates
- Previously
Rigetti launched the 108-qubit system in April 2026. External researchers subsequently measured state transfer across selected routes, finding that favorable paths and uniform reliability are different properties.
- Now
Rigetti launched the 108-qubit system in April 2026. External researchers subsequently tested selected routes using return circuits. Their October revision distinguishes the measured return score from a certificate of above-classical unknown-state transfer.
- Retained for this claim (2)
- What remains uncertain
- Previously
Physical qubit count and launch gate fidelity do not establish useful circuit depth or fault tolerance. An August 2026 external preprint finds substantial route-dependent performance; its results are specific to the tested conditions.
- Now
Physical qubit count and launch gate fidelity do not establish useful circuit depth or fault tolerance. The October 2026 preprint revision explicitly says its empirical 2/3 return-score cutoff does not certify above-classical unknown-state transfer; route, calibration and finite-shot conditions still matter.
- Research evidence: Amazon Braket launches Rigetti Cepheus 1 108Q superconducting device
- Previously
AWS and Rigetti document a twelve-chiplet processor, on-demand access, reservations, current calibration queries and Braket SDK, CUDA-Q, PennyLane and Qiskit workflows.
- Source title
- Amazon Braket launches Rigetti Cepheus-1-108Q superconducting device
- Source publication date
- 1 Jun 2026
- Source type
- technical
- Marked independent
- Not recorded
- Now
AWS and Rigetti document a twelve-chiplet processor, on-demand access, reservations, current calibration queries and Braket SDK, CUDA-Q, PennyLane and Qiskit workflows.
- Source title
- Amazon Braket launches Rigetti Cepheus-1-108Q superconducting device
- Source publication date
- 1 Jun 2026
- Source type
- technical
- Marked independent
- Not recorded
- Where to look
- Device architecture; calibration queries; Getting started; Selecting high-fidelity qubits
- Source checked
- 12 Nov 2026
- Source or product version
- AWS/Rigetti article, 1 June 2026; checked 12 November
- Limitations
- Partner delivery/integration evidence; launch fidelity is historical and current calibration must be queried separately.
- Retained for this claim (1)
- Research evidence: How Far Can You Do Nothing On a Quantum Computer?
- Previously
External researchers report route-dependent state-transfer tests on Cepheus-1-108Q. Results depend on the chosen paths, calibration snapshot and finite-shot success rule; this is a preprint.
- Source title
- How Far Can You Do Nothing On a Quantum Computer?
- Source publication date
- 22 Aug 2026
- Source type
- paper
- Marked independent
- Not recorded
- Now
The v2 preprint reports route-dependent return scores on Cepheus-1-108Q. Its empirical cutoff is not a certificate of above-classical transfer of unknown states; tested paths, calibration and finite shots constrain interpretation.
- Source title
- How Far Can You Do Nothing On a Quantum Computer?
- Source publication date
- 22 Aug 2026
- Source type
- paper
- Marked independent
- Not recorded
- Where to look
- Abstract; revision comments and submission history
- Source checked
- 12 Nov 2026
- Source or product version
- arXiv:2608.21904v2, 5 October 2026
- Limitations
- Empirical return score does not certify above-classical unknown-state transfer; finite routes/calibration/execution time constrain results.
- Retained for this claim (1)
Recorded dates use UTC and show when QubitWire saved the comparison. Review dates show the evidence check; neither is a new claim about when the underlying event happened. This view preserves the original research and assessment methodology.